Compilare: user.cpp: In function ‘int main()’: user.cpp:18:38: warning: suggest parentheses around assignment used as truth value [-Wparentheses] v[l1 - 'a' +1][l2 - 'a' + 1] = a[l2 - 'a' +1][l2 - 'a'+1] = 1; ^ user.cpp:40:20: warning: ‘s’ may be used uninitialized in this function [-Wmaybe-uninitialized] s+= a[n][i]; ^